- Ientile, Renzo
- Iepure, Sanda
- Ieradi, Luisa Anna
- Ievers, R W
- Iezhova, Tatjana A
- Iffat, Fehmida
- Ifft, John D
- Iftikhar, Ali Khan
- Iftikharand, Farida
- Iftime, Alexandru
- Iftime, Oana
- Iftner, David C. (David Carl), 1950-
- Iga, Chie
- Iga, Tetsuro
- Iganci, João R.
- Iganci, João Ricardo Vieira
- Igarashi, Shin-Ichi
- Igarzabal, Daniel
- Igdoura, Suleiman
- Igel, Benzion
- Igersheim, Anton
- Iggulden, David
- Iggulden, May,
- Igl, Lawrence D
- Iglesias Andreu, Lourdes Georgina
- Iglesias Hernández, Jesús A.
- Iglesias, ALG
- Iglesias, Ana
- Iglesias, Ari
- Iglesias, C
- Iglesias, C G
- Iglesias, C Lopez
- Iglesias, Javier
- Iglesias, José Manoel Pires
- Iglesias, María del Rosario
- Iglesias, Mónica
- Iglesias, Patricia P.,
- Iglesias, R
- Iglesias, Ricardo
- Iglesias-Rios, Ricardo
- Iglseder, F. X.
- Ignace, David
- Ignacimuthu, S
- Ignacimuthu, Savarimuthu
- Ignácio, Áurea R A
- Ignácio, Juliana Martinhão
- Ignacio, Leroy
- Ignacio-Apaza, Javier
- Ignatieff, Vladimir,
- Ignatijeva, Ekaterina I.
- Ignatius, Saint, Bishop of Antioch, approximately 110
- Ignatov, Michael S.
- Ignatova-Ivanova, Tsveteslava
- Ignatti, Ana Cristina
- Ignoffo, Carlo Michael
- Igo, C. W., Mrs.
- Igo, Marguerite.
- Iguchi, Akira
- Iguchi, Taisen
- Iguchis, Akira
- IGY World Data Center A--Oceanography.
- Iha, Danilo S.
- Ihára, Lúcio Tshuyoki
- Ihara, Yoh
- Iharlegui, Laura
- Ihering, H. von (Hermann), 1850-1930
- Ihering, Rodolpho von, 1883-1939
- Ihl, Thomas
- Ihle, J. E. W. (Johan Egbert Willem), 1879-1956
- Ihle, Kate
- Ihlenfeldt, Hans-Dieter
- Ihli, Carl Bolton.
- Ihlow, Flora
- Ihne, Egon
- Ihrig, Herbert G.
- Ihsan, Sleiman
- Ihssen, Georg
- Ihssen, Peter E.
- Ihtimanski, Ivo
- Iiabtekt, Ernst
- Iida, Shigeo
- Iida, Taichi
- Iigo, Masayuki
- Iijima, Hayato
- Iijima, Isao, 1861-1921
- Iijima, Kai.
- Iino, Teruhiko
- Iishiba, Eikichi.
- Iizuka, Akira
- Iizuka, Yoshiyuki
- IJland, Steven
- Ijzereef, Gerard Frans
- Ikabanga, Davy U.
- Ikagawa, Raine
- Ikai, Sanzaemon.
- Ikata, Takaaki
- Ikawa, Haruyoshi
- Ike Hawkersmith Nursery,
- Ikebe, Chiho
- Ikebe, Chikako
- Ikeda Castrillon, Solange Kimie
- Ikeda, Andrea Kyoko
- Ikeda, Eisen, 1790-1848
- Ikeda, H
- Ikeda, Hiroshi
- Ikeda, Iwaji
- Ikeda, Kenichi
- Ikeda, Koson, 1802?-1867?
- Ikeda, Mark
- Ikeda, Priscila
- Ikeda, S
- Ikeda, Tetsuya
- Ikeda, Tomochika.
- Ikeda, Y
- Ikeda, Yoshimine
- Ikegami, Susumu
- Ikehara, Isaac I
- Ikehara, Walter
- Ikejiri, Takehito.
- Iken, Katrin
- Ikenaga, Hiroshi
- Ikeno, Seiichirō, 1866-1943
- Ikenobō, Senjō, 1769-1832
- Ikenobō, Senmyō, 1793-1864
- Iker, Sam.
- Ikerd, Harold
- Ikeya, Noriyuki
- Ikhwanuddin, Mat Esa Mohd
- Ikonga, Jérôme Mokoko
- Iković, Vuk
- Ikyaagba, Emmanuel
- Ilagan, Jose M.
- Ilan, Micha
- Ilander, Hanna
- Ilangakoon, Anoukchika D
- Ilango, K
- Ilardi, Vincenzo
- Ilari, Alessio
- Ilarri, Martina Di Iulio
- Ilayperuma, Isurani
- Ildrewe, Miss.
- Ile, George-Adelin
- Iles, David T.
- Iles, Dudley
- Iles, George, 1852-1942
- Iles, Jeff
- Iles, Matthew
- Ilgaz, Cetin
- Ilgen, Lewis Wallace.
- Ilgenfritz Orchids (Nursery),
- Ilgenfritz, Charles A.
- Ilgenfritz, Israel E.
- Ilgenfritz, Margaret M
- Ilger, Jan-Michael
- Ilha, Paulo
- Ilharco, Fernando Albano, 1935-
- Ilias Saxelmcipʻo Universiteti,
- Ilʹi︠a︡shenko, V. I︠U︡. (Valentin I︠U︡rʹevich)
- Ilić Milošević, Marijana
- Ilić, Bojan
- Ilić, Marija
- Ilić, Tijana
- Ilʹichev, V. D. (Valeriĭ Dmitrievich)
- Iliev, Ivan
- Iliev, Martin
- Iliev, Nasko
- Iliev, Petko
- Ilieva, Bilyana
- Ilieva, Rositsa
- Iliff, David A
- Iliff, Marshall J.
- Iliffe,Thomas M.
- ILINÁ, Anna
- Ilinkin, Vladimir
- Ilinsky, Yuri
- Iliopoulos, Yorgos
- Iliopoulou-Georgudaki, Joan
- Ilizaliturri Hernández, César Arturo
- Iljinsky, Ivan
- Ilka Nurseries.
- Ilkal, M A
- Ilkiu-Borges, Anna L
- Ilkiu-Borges, Anna Lidza
- Ilkiu-Borges, Anna Liza
- Ilkiu-Borges, Anna Luiza
- Ilkiu-Borges, Anna Luiza
- Ilkiu-Borges, Anua L
- Ilkiu-Borges, Fernanda
- Ilkova, Julia
- Illana, C
- Illana, Heykoop C M
- Illander, Hanna
- Illarionova, Irene D
- Illenseer, Rafael
- Illert, Christopher R
- Illes, Colin
- Illescas Riquelme, Carlos Patricio
- Illescas-Espinosa, Oscar
- Illg, Paul L
- Illi, Julia
- Illick, J Theron
- Illick, Joseph S. (Joseph Simon), 1884-1967
- Illidge, Rowland
- Illidge, Thomas
- Illien, Gildas
- Illies, Joachim
- Illig, Gottwald
- Illiger, Johann Karl Wilhelm, 1775-1813
- Illingworth, J. F., 1870-1949
- Illingworth, Jeanne M.
- Illinik, Jeffrey J
- Illinois Agricultural Association.
- Illinois Archeological Survey.
- Illinois Audubon Society.
- Illinois Coal Strippers Association.
- Illinois Cooperative Crop Reporting Service.
- Illinois Council on Forestry Development.
- Illinois Crop Protection Technology Conference.
- Illinois Duroc Association,
- Illinois Farmers' Institute.
- Illinois Farmers' Institute. Meeting Monmouth, Ill.) 1922-
- Illinois Grape Growing and Wine Making Association.
- Illinois Institute of Natural Resources.
- Illinois Native Plant Society.
- Illinois Natural Areas Inventory.
- Illinois Natural History Society.
- ILLINOIS NATURAL HISTORY SURVEY HAVANA RIVER RESEARCH LAB.
- ILLINOIS NATURAL HISTORY SURVEY HAVANARIVER RESEARCH LAB.
- Illinois Nature Preserves Commission.
- Illinois Nurseries Inc.
- Illinois Nursery.
- Illinois Ornithological Society.
- Illinois Racing Board.
- Illinois RiverWatch Network.
- Illinois Seed & Nursery Co., Inc.
- Illinois Seed Co.
- Illinois Shorthorn Breeders' Association.
- Illinois State Academy of Science.
- Illinois State Agricultural Society.
- Illinois State Bee-keepers' Association.
- Illinois State Dairymen's Association.
- Illinois State Entomologist.
- Illinois State Geological Survey.
- Illinois State Grange.
- Illinois State Historical Library.
- Illinois State Horticultural Society.
- Illinois State Laboratory of Natural History.
- Illinois State Museum Society.
- Illinois State Museum.
- Illinois State Nurserymen's Association.